Automatical round when starting: When car engine starts, the system will activate the car monitor and the all the camera around one by one to check the around for 10 seconds, then turn off. Automatically rear :When you pull the reverse gear (Left/Right turning no triggered), the system will activate the monitor and rear camera till the reverse gear back, then switches to front camera for 10 seconds then shut off. Front mode:The system with front mode as default.Front controlled by switch(included) .Press the control switch for 2 seconds, car monitor and car front camera will be working all the time, if no other trigger working. And then you could shut off the front video by re-press the control switch for 2 seconds. Side mode:Press the control switch less than 1 second to enter Side Mode.When you turn on the turning switch, this system will activate Monitor and Side camera (Left/Right side camera is controlled by Left/Right steering lamp). The monitor and camera will turn off after 1.5 seconds when steer turning is finished.Press the control switch less than 1 second again to enter Front Mode. Description: Video output: Two videos output, one for car monitor, the other for car DVR. Front camera power: supplied by control box system. Rear camera power: supplied by control box system, or could be supplied by reverse lamp power. Left/Right side camera power: supplied by control box system Trigger priority: Right --Left --Back --Front Switch function: Press for less than 1 second: Side mode / Front mode Press for 2seconds (in Front mode): Front always working / Front turn off Parameters: The system working current: Max: 50MA. (Excludes working current of cameras) The system working power: 9-30V. (Power supply to cameras is the same as the system input voltage, in 24V vehicle, please use 24V cameras) System signal: /NTSC/SECAM Video output: 1.0VPP/75 Colour:Black Material:ABS Contents: 1 x 4 x Camera Extension Cord Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.